So we have passed the 25.000 words mark, and we are coming to the end of the middle and the beginning of the end. Or something.
And the middle is always a problem. That’s where the story sags, where the excitement of the start is gone, and the excitement of the finish is yet to come.
I have no figures about this, but I think this is where most people drop their writing and move on to another story, or another job altogether.